Poor mileage when hot
10-11-2011, 11:17 PM
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2009 E320
Poor mileage when hot
2009 E320 at 70mph highway, if it is hot out 95-100F I seem to get 30 to 31 MPG. If it cools down to 70 I can get 34-35 MPG at 70 MPH. Anyone experience this? Is there something wrong with my car?
10-12-2011, 02:06 PM
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06' w211 E500 Sport
Simple - cold compressed air gets better bang for the buck in your Air/Fuel ratio.
If you have hot air outside, the molecules are not so close together, and so when it is combusted, there is not so much bang for the buck
Pro Tip: Notice the throttle response you feel when driving in light fog (of course you don't want to speed in dense fog) but you will fill the difference.
If you have hot air outside, the molecules are not so close together, and so when it is combusted, there is not so much bang for the buck
Pro Tip: Notice the throttle response you feel when driving in light fog (of course you don't want to speed in dense fog) but you will fill the difference.
10-23-2011, 11:22 AM
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2009 E320
Poor mileage when hot
The climate control is set to 74 under both conditions (is that what you mean).
I also understand about cooler air being more efficient, but I thought the turbo was suppose to adjust for changes in air density.
I also understand about cooler air being more efficient, but I thought the turbo was suppose to adjust for changes in air density.
10-27-2011, 01:38 AM
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2009 E320
Poor Mileage when hot
I found this on the web:
Consumer Reports wrote in its June issue. "Using air conditioning while driving at 65 mph reduced the Camry's gas mileage by about 1 mpg. The effect of opening the windows at 65 mph was not even measurable."
The effect of turning off the air is probably more profound in stop-and-go traffic situations, but not much.
"I would guess it could be a 5% mileage saving," Mazor said.
5% at 32MPG is 1.6 MPG. I am seeing more like 5 MPG difference which is about 15%. We are not talking AC completly on or off in my case, maybe just working harder. 15% just seemed like a lot to me and was wondering if anyone else had noticed this. I certainly have not in any of my other cars.
Consumer Reports wrote in its June issue. "Using air conditioning while driving at 65 mph reduced the Camry's gas mileage by about 1 mpg. The effect of opening the windows at 65 mph was not even measurable."
The effect of turning off the air is probably more profound in stop-and-go traffic situations, but not much.
"I would guess it could be a 5% mileage saving," Mazor said.
5% at 32MPG is 1.6 MPG. I am seeing more like 5 MPG difference which is about 15%. We are not talking AC completly on or off in my case, maybe just working harder. 15% just seemed like a lot to me and was wondering if anyone else had noticed this. I certainly have not in any of my other cars.
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10-28-2011, 06:12 PM
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2009 E320
O.K. everyone agrees that the AC is going to cost about 1-2 MPG. I am seeing variation of 4-5 MPG so it cannot be just explained by the AC. Also we are not talking about the AC being all on or all off, we are only considering increased use do to a temperature increase.
